Modular drawer system

ABSTRACT

A modular drawer system provides a system of interchangeable components that are easy to assemble. The system requires few fasteners because most of the parts are slidably interconnected. Many parts perform dual functions. A removable lock tray and a tracking mechanism to provide easier steering of a rolling cart are provided. A lock bar assembly with few moving parts is easily assembled. In addition, an accessory track provides two types of attachment means for accessories, a more flexible, snap-on attachment and a more permanent, bolted attachment.

BACKGROUND OF THE INVENTION

This invention pertains to a modular drawer system with components thatare slidable connected. More particularly, it pertains to a modularrolling cart. Even more particularly, it pertains to a modular cart thatcan be used to dispense medication.

In settings where it is necessary to dispense medication to a largenumber of individuals in an efficient manner, such as a nursing home ora hospital, drawer systems containing a plurality of drawers and/orcassettes are often utilized. Typically, these drawer systems aresupported on wheels to provide a rolling medication cart. A cassette isdefined as a transportable storage device that may slide into a cartmuch as a drawer does. The purpose of the cassette is to provide a meansof exchanging empty medication containers with ones that have beenrefilled. The cassette may comprise a plurality of drawers, trays orbins for organizing medications. Typically, when a cassette is insertedinto the cart, the cassette drawers are locked by the same lockingmechanism that locks the other drawers. In addition, the cassette mayhave a separate locking system so that the cassette drawers can belocked when the cassette is removed from the cart. Cassettes are oftenreceived by nursing homes with a selection of medication. When thatmedication has been used, the entire cassette is removed from the cartand returned to the pharmacy for replacement. A second cassette isinserted in its place.

These drawer systems typically contain drawers for the medications aswell as patient records and other information necessary to the healthcare professional administering the medication. In addition, it ispreferable that these carts act as mobile work stations, so that theyprovide a surface for writing and recording information, means formaintaining orderly patient charts, means for dispensing supplies andother consumables, and that they include disposal means for trash andfor used sharps, such as needles.

Depending on the circumstances of use of such a cart, many differentstyles may be appropriate. Some applications require a cart with fewer,deeper drawers, while other applications require a cart with numerous,more shallow drawers. In addition, it may be desirable to include somedrawers that provide additional locking capability because they maycontain narcotics or other controlled substances. Cart size is also afactor. Depending on the space available in the hospital or nursing homehallways, a smaller or larger cart may be desired.

From a manufacturer's perspective, it is desirable to have as muchuniformity among product lines as possible. It would be preferable tohave common parts that can be used to build a multitude of carts whichare customized to meet each individual customer's requirement byoffering different sizes, shapes, and numbers of drawers. Furthermore,it may be desirable to have accessories such as sharps disposalcontainers, waste containers, additional work or writing surface space,lighting, and a chart storage area.

Medication carts are often used in nursing homes. The hallways innursing homes are often carpeted, therefore, the wheels on a cart mustbe able to roll freely and steer easily on such carpeted floors, as wellas on tiled floors. Furthermore, the cart needs to be able to be steeredin a relatively small turning radius by one individual with a minimalamount of effort. The cart must also be stable, it should not easilytopple over.

As previously noted, some of the medications contained within the cartmay be controlled substances and so require an extra level of security.To prevent unauthorized access to any of the materials contained withinthe cart, it is desirable that the entire cart be able to be locked atany time when the individual responsible for the cart is away from it.Preferably, it includes a mechanism that allows any open drawer to beclosed, but not reopened, while the lock is activated. More preferably,it allows for a drawer to be locked in more than one position so that ifa drawer is partially closed it cannot be pulled open, but is locked inthat partially closed position to minimize access to its contents. Thislocking mechanism can include a key lock. The lock mechanism may also beelectronic so that it can be activated remotely.

It is desirable to have a simple, easily fabricated lock bar assembly tolock the drawer system with as few components as possible. Prior artsystems, such as those disclosed in U.S. Pat. No. 4,822,116, Relyea etal, issued Apr. 18, 1989, provided a lock bar assembly comprising anextrusion that housed a lock tab, a spring and a pin for each drawerthat was to be locked. The entire column, including the extrusion, movedup and down to lock and unlock the drawers. The locking tabs in thatconfiguration moved vertically to engage a notch in the drawer slide andlock the drawer. It is more desirable to have a single, one piecelocking tab for each drawer plane per cart side that moves within astationary extruded column. A drawer plane is defined as a horizontalplane defined by the drawer guides in which one or more drawer slide canbe located. If there are two drawer bays on a side, or if the drawersystem has drawers on both sides, then there will be the possibility fortwo, or more, drawer slides to be in one drawer plane. Such aconfiguration is simpler, less expensive to make and takes less time toassemble into a lock bar assembly.

The locking mechanism needs to be durable. A drawer system of this typeis often locked and unlocked many times a day. Each time a medication isremoved and the operator walks away from the cart, the cart shouldtypically be locked. To administer the next medication, the operatormust unlock the cart, take out the medication and then relock the cart.Depending on the application, the lock may need to withstand hundreds oflockings and unlockings every day. It should provide years of reliableservice. It is preferable that the locking mechanism be easilyreplaceable, if that should become necessary. For example, if a key werelost, the locking mechanism could be changed so that the previous key nolonger unlocks the cart. A replaceable locking mechanism also providesmanufacturing ease and the ability to replace or repair damaged locksreadily. It is more preferable that the locking mechanism be a modular,replaceable article.

Assembling customized carts can be a time-consuming and expensiveprocess. To make the carts more cost efficient, and therefore moreattractive to the customers, it is preferable that a customized cart beable to be assembled with the fewest number of fasteners in the leastamount of time. It is more preferable that components lock together orslidably interconnect, rather than using numerous fasteners such asscrews or rivets. Furthermore, to minimize assembly time, the number ofparts per drawer system, and the overall system cost, it is preferablethat individual components be designed to perform more than onefunction.

The drawers in such a cart preferably encourage an operator to pull themopen from the middle of the drawer. It encourages proper drawer openingand prevents a drawer from binding or seizing up as it might if it werepulled from the side at an angle.

Depending on the needs of a customer, the cart configuration may provideaccess to drawers on one side or both sides of the cart. Preferably thetwo sides can be locked and unlocked separately so that one side can beaccessed while the other side is securely locked.

Preferably the carts can be refurbished quickly and inexpensively. Theyshould be manufactured with easily replaceable parts that will allow fora new appearance without requiring replacement of all or most of theparts, particularly replacement of the more expensive parts. They shouldalso be able to be reconfigured so that a customer who previouslydesired one drawer configuration can request another at minimal cost andwith the minimal amount of down-time. Furthermore, it is desirable thatthe customers be able to refurbish the carts at their own facilitywithout specialized tooling and without having to ship the cart back tothe manufacturer.

SUMMARY OF THE INVENTION

The modular drawer system of the present invention is designed to meetthe requirements outlined above.

In one aspect, the present invention provides a modular drawer systemcomprising a frame, comprising a substantially rectangular base and atleast four support columns extending from the base; at least four cornercolumn trim pieces, each being slidably connected to one of said supportcolumns; a top, which is attached to said frame; at least one drawer baycomprising two drawer guide panels which are slidably connected to saidframe by said corner column trim pieces; and, at least one drawersupported by said two drawer guide panels.

In another aspect the present invention further provides a releasabletracking mechanism for a cart that prevents at least one caster assemblyfrom swiveling while allowing wheels of the caster assembly to continueto roll. In a further aspect the present invention provides a lock barassembly for locking a plurality of drawers. In yet another aspect, thepresent invention provides a removable lock tray. Furthermore, anotheraspect the present invention provides a lockable lid for covering atleast a portion of a drawer body. In another aspect, the presentinvention provides an accessory track that provides at least twodifferent means for attaching accessories to a device.

Further aspects of the present invention will become apparent from thedescription provided below.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a front elevational view of a modular drawer system of thepresent invention illustrated with two drawer bays, caster assembliesand a shelf.

FIG. 2 is a side elevational view of the modular drawer system of FIG. 1with two the drawers in their open position.

FIG. 3 is an perspective view of the modular drawer system of FIG. 1with two drawer bays in their open position.

FIG. 4 is a fragmentary view of the modular drawer system of FIG. 1showing the shelf at a different height.

FIG. 5 is a perspective view of a modular drawer system of the presentinvention illustrated with a refuse container.

FIG. 6 is a front elevational view of the drawer system of FIG. 5.

FIG. 7 is a fragmentary perspective view of a modular drawer system ofthe present invention with a refuse container and handles.

FIG. 8 is an exploded perspective view of a frame illustrated withcaster assemblies and a bumper assembly.

FIG. 9 is a perspective view of a frame, illustrated with casterassemblies and a bumper assembly.

FIG. 10 is a exploded view of an accessory track.

FIG. 11 is a perspective view of a caster assembly

FIG. 12 is a top plan view of the caster assembly of FIG. 11.

FIG. 13 is a perspective view of the underside of a tracking mechanismof the present invention.

FIG. 14 is a fragmentary perspective view of the tracking mechanism ofFIG. 13, wherein the locking pin and detent are not engaged.

FIG. 15 is a fragmentary perspective view of the tracking mechanism ofFIG. 13, wherein the locking pin and the detent are engaged.

FIG. 16 is a exploded view of the foot pedal, connecting means andlocking plates of the tracking mechanism.

FIG. 16a is a fragmentary elevational view, partially in cross section,of the foot pedal, and plunger of the tracking mechanism, and aprotuberance on the underside of a bumper assembly.

FIG. 17 is an exploded view of a drawer guide panel and lock barassembly of the present invention.

FIG. 18 is an perspective view of the drawer guide panel and the lockbar assembly of FIG. 17.

FIG. 19 is a fragmentary perspective view, partially in cross section,of a frame and drawer guide panels.

FIG. 20 is perspective view of the corner column trim piece attached tothe support column.

FIG. 21 is a fragmentary perspective view, partially in cross section,of the lock bar assembly and drawer guide panel.

FIG. 22 is an exploded perspective view of a lock bar assembly of thepresent invention, illustrated with locking tabs on one side only.

FIG. 23 is an exploded perspective view of a lock bar assembly of thepresent invention, illustrated with locking tabs on two sides.

FIG. 24 is an fragmentary perspective view of the lock tray.

FIG. 24a is an exploded view of the lock tray with an electronic releasemechanism.

FIGS. 25, 26, and 27 a,b,c are plan views of extruded profiles.

FIG. 28 is a front elevational view of an end panel.

FIG. 29 is a fragmentary cross section through line 29—29 of FIG. 28.

FIG. 30 is a perspective view of a top.

FIG. 30a is a plan view of the underside of a top, showing ribs.

FIGS. 31-35 are exploded perspective, top plan, front elevational,bottom plan and side elevational views, respectively, of a drawer.

FIGS. 36 and 37 are exploded perspective and perspective views,respectively, of a punch card drawer.

FIG. 38 is a perspective view of a punch card tub.

FIGS. 39 and 40 are exploded perspective and perspective views,respectively, of a drawer with a lockable lid.

FIGS. 41 and 42 are perspective and top plan views, respectively, of anaccessory track.

FIGS. 43 and 44 are exploded perspective and perspective views,respectively, of the accessory bar.

FIG. 45 is an exploded perspective view of a handle.

FIGS. 46 and 47 are perspective and exploded perspective views,respectively, of a cart top organizer.

FIGS. 48, 49 and 50 are front elevational, side elevational andperspective views, respectively, of a label holder.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

While the present invention is described in the form of a medicationcart, it is not so limited. The present invention provides for anydrawer system wherein many of the components are slidably connected.More particularly, because the components are configured to be slidablyinterconnected, the present invention provides for a drawer systemwherein the number of fasteners are significantly reduced over thenumber of fasteners required by drawer systems of the prior art. Theslidable connectors also allow the drawer system of the presentinvention to be assembled quickly. Furthermore, once the frame,described below, has been assembled, the balance of the drawer system ofthe present invention can be assembled without the use of alignmentfixtures or specialized tools.

As shown in FIGS. 1-7, the drawer system indicated generally at 10 ofthe present invention is a modular system comprising a frame 12 (shownin FIGS. 8 and 9), a top 16 and drawer guide panels 18 (shown in FIG.19). The drawer system 10 can be used in any application where it isdesirable to have lockable drawers 20. The drawer system 10 can be usedin stationary cabinetry with drawers 20 on one side of the cabinet, oron both sides of the cabinet, in a back-to-back arrangement. The drawersystem 10 can also be supported by wheels or caster assemblies 22. Thisdrawer system 10 can be outfitted with various drawers 20 and otheraccessories to provide a customized system to meet the requirements ofthe customer.

Looking at FIGS. 8 and 9, the frame 12 of the present inventioncomprises a substantially rectangular base 24 with an upper and lowersurface and a length and a width. The frame 12 further comprises supportcolumns 26 that extend from the upper surface of the four corners of thebase 24. When more than one drawer bay 28 is desired, the frame 12 mayfurther comprise at least two additional support columns 30 that are bedisposed along the length of the upper surface of the base 24. Theadditional support columns 30 must be situated so that one additionalsupport column 30 is on one side of the base 24 and the other additionalsupport column 30 is on the other side of the base 24, and the twoadditional support columns 30 form a plane that is perpendicular to thelength of the base 24. The frame 12 may also include at least twotransverse support rods 32 connecting the support columns 26, which aredisposed along a length of the frame 12, to one another at the upperends of the support columns 26. The frame 12 does not require transversesupport rods 32 when sufficient stability is provided by the top 16,which is then attached to the support columns 26. A suitable top 16 willbe described in further detail below.

The frame 12 can be manufactured of any material of sufficient strengthand rigidity to support the drawer system 10 and provide the necessarystiffness. Preferably, the material is long-lasting, corrosion resistantand lightweight. The frame 12 can be made of any structural materialknown in the art including structural polymers, particularly, forexample, graphite or glass pre-impregnated polymers, wood, or metal, orany combination thereof. Preferably, the base 24 and transverse supportrods 32 are made of tubular steel. More preferably, they are made ofroll formed 1008 steel. Preferably, the support columns 26 and 30 aremade from extruded aluminum. More preferably, they are made fromextruded 6063-T6 aluminum. The overall size of the frame 12 is dictatedby the desired size of the drawer system 10.

The frame 12, including the base 24, the support columns 26 and thetransverse support rods 32, can be manufactured as one piece, e.g.molded as a single item, or it can comprise individual parts attached toone another by welding, bolts, bonding or any other attaching means. Theframe 12 components can be produced by any methods, including, but notlimited to, molding, casting, extruding and machining. It is notnecessary for all components to be made in the same way. Morepreferably, the frame 12 comprises a base 24 made of components that arewelded together. The support columns 26 are preferably bolted to thebase 24 and to the transverse support rods 32.

If a rolling drawer system 10 is preferred, then at least four casterassemblies 22 are attached to the underside of the frame 12. Such casterassemblies 22 are preferably attached at the four corners of the frame12 to maximize stability and ease of rolling. See FIGS. 11 and 12. Thecaster assembly 22 comprises a caster 34 and at least one wheel 36. Thecaster 34 provides rotation to the caster assembly 22 about a verticalaxis, as indicated by directional arrow 42, and a means of attachment ofthe assembly to the frame 12, such as a mounting stud 35. The wheel(s)36 provide rotation about a horizontal axis, as indicated by directionalarrow 44. To minimize the number of components necessary to build adrawer system 10, it is preferable that the means of attaching thecaster assembly 22 to the frame 12 also act as a means of attaching abumper assembly 72 to the drawer system 10. Preferably, the mountingstud 35 of the caster 34 is inserted through a perforation 78 in thebumper 74, thereby holding the bumper 74 in place, as shown in FIG. 8.

The caster assemblies 22 can be any type of caster assemblies 22 knownin the art. The caster assemblies 22 need to roll easily, support theweight of the drawer system 10 and its contents, and provide stability.While each caster assembly 22 can comprise one caster 34 and one wheel36, it is preferable that each caster assembly 22 comprise one caster 34and two wheels 36. In a caster assembly 22 with two wheels 36, thewheels 36 are preferably disposed on either side of the caster 34.Preferably, each wheel 36 is approximately 5″ in diameter. The caster 34and wheel(s) 36 of each caster assembly 22 can be made of metal,thermoplastic, thermoset plastic, elastomeric materials, or combinationsthereof. Preferably, the caster 34 and wheel(s) 36 are injection moldedthermoplastic. More preferably, the wheel 36 includes an elastomericband 38 that covers its perimeter.

Preferably at least one caster assembly 22 has a releasable trackingmechanism 40 that can be activated for all affected caster assemblies 22from one point on the drawer system 10. If the drawer system 10 includesa fifth caster assembly 22 that is located approximately in the centerof the base 24, it is preferable that the releasable tracking mechanism40 act upon that fifth caster assembly 22. More preferably, two casterassemblies 22, located in a plane which is perpendicular to thedirection of travel, have a releasable tracking mechanism 40. When it isengaged, the tracking mechanism prevents the caster assemblies 22 fromrotating around a vertical axis indicated by directional arrow 42 andaligns the wheels 36 parallel to the direction of travel of the cart.Because the caster 34 can no longer rotate about a vertical axis asindicated by directional arrow 42 but the wheels 36 can still rotateabout a horizontal axis indicated by directional arrow 44, this providesfor easier steering of the drawer system 10.

The tracking mechanism 40, shown in FIGS. 13-16, can be activated by anymechanical or electromechanical means, including but not limited to afoot pedal 46, a triggering device on the handle or elsewhere on thedrawer system 10, or by remote electronic means. Such a releasabletracking mechanism 40 preferably comprises a foot pedal 46 whichactivates it. The tracking mechanism 40 further comprises a lockingplate 48 which causes a locking pin 50 to become engaged by a detent 52.There is no limitation as to the location of the locking pin 50 and thedetent 52. The locking pin 50 can be located on the locking plate 48, inwhich case the detent 52 is then located on the caster 34. The lockingpin 50 can also be located on the caster 34 and the detent 52 is locatedon the locking plate 48. While there is no limitation on theconfiguration of the locking pin 50 and the detent 52, it is preferablethat the detent 52 include a means for allowing the caster assembly 22to lock into place when the caster 34 is out of alignment at the timethe tracking mechanism is engaged. Such means can include an angledguide ramp 54 which allows the caster assembly 22 to swivel intoposition until the locking pin 50 is captured by the detent 52 but doesnot allow the locking pin 50 to disengage from the detent 52 until thetracking mechanism is released.

The tracking mechanism can be released by means of the foot pedal 46, asshown in FIG. 14. Preferably, the foot pedal 46 is located approximatelyin the center of the width of the frame 12. Preferably, the foot pedal46 includes a spring-loaded plunger 58 that moves from one side to theother side of a protuberance 56 located on the underside of either theframe 12 or the bumper assembly 72 when the foot pedal 46 is depressed.Preferably, the protuberance 56 is located on the underside of thebumper assembly 72. When the plunger 58 is on one side of theprotuberance 56, the locking plates 48 are rotated such that the lockingpin 50 is engaged by the detent 52. Conversely, when plunger 58 is onthe other side of the protuberance 56, the locking plates 48 are rotatedsuch that the locking pin 50 is disengaged from the detent 52.Preferably, the foot pad is attached to the locking plates 48 byconnecting means 60 which rotates when the foot plate is activated,causing the rotation of the locking plate 48 into position to capturethe locking pin 50, as shown in FIG. 15.

The locking plate 48, locking pin 50 and the foot pedal 46 can be madeof any material that can withstand wear, the force applied by theoperator, and the force of the locking pin 50 as it slides intoposition. Such materials can include plastics, metals or combinationsthereof. Preferably the foot pedal 46, locking plate 48 and locking pin50 are manufactured of thermoplastic. More preferably, the locking plate48 and foot pedal 46 are made of glass reinforced Nylon. Morepreferably, the locking pin 50 and plunger 58 are made of materials thatexhibit toughness, good lubricity and good wear characteristics. Mostpreferably, the locking pin 50 and plunger 58 are made of acetal. Thetracking mechanism components can be made by any means known in the art,preferably they are injection molded or compression molded. Theconnecting means 60 between the foot pedal 46 and the locking plate 48can be made of any material. Preferably the connecting means 60 is madefrom a material that can provide stiffness in a compact design. Theconnecting means 60 are more preferably made of metal. Even morepreferably, it is made of steel. Most preferably, the steel is platedfor corrosion protection.

At least one of the caster assemblies 22 may further comprise a wheellock 70 that prevents the wheel 36 from rotating about the horizontalaxis indicated by directional arrow 44 and thereby prevents the cartfrom rolling. Such wheel locks 70 are well known in the art. There is nolimitation on the type of wheel lock 70 that can be used in the presentinvention.

The four support columns 26 extending from the base 24 at its fourcorners include means for holding an extruded covering, side and backpanels and accessory tracks, all of which will be described in greaterdetail below.

As FIG. 8 shows, when the drawer system 10 is supported by casterassemblies 22, a bumper assembly 72 is preferably attached to theperimeter of the base 24. This bumper assembly 72 prevents damage to thedrawer system 10, walls, woodwork, doorways, etc. It also provides amore pleasing appearance as the bumper assembly 72 can be colored tocustomer specifications. Such a bumper assembly 72 is preferably made ofan impact absorbing material such as plastic, rubber, an elastomericmaterial, or some combination thereof. More preferably, the bumperassembly 72 comprises a rigid compression molded bumper 74 with anelastomeric bumper pad 76 attached to its perimeter. The bumper pad 76can be attached by a snap lock feature, bonding, or by molding onto thebumper 74. More preferably, the bumper pad 76 is molded onto the bumper74.

The bumper assembly 72 can be attached to the frame 12 by any meansknown in the art, including a snap lock feature, fasteners or bonding.Preferably, it is locked in place by the insertion of the casterassemblies 22 as described above.

Looking at FIGS. 17-19, and 21, at least two drawer guide panels 18 areinserted into the frame 12. These drawer guide panels 18 are preferablylocated at both ends of the frame 12. The drawer guide panels 18comprise a panel 80 having numerous guide rails 82. A drawer slide 124of a drawer 20 is supported by the guide rails 82 of the drawer guidepanels 18. The drawer guide panels 18 preferably extend substantiallyacross the width of the base 24 and extend substantially the height ofthe frame 12.

To minimize the number of different pieces that need to be manufactured,while maximizing the flexibility to manufacture a cart to a customerspecification, the drawer guide panels 18 are preferably made of atleast two components 84, as FIG. 17 shows. In the most preferableconfiguration, a single drawer guide panel 18 is made of two individualcomponents 84. Preferably, each component 84 is either a five guide railconfiguration or a four guide rail configuration. This allows themanufacturer to produce a drawer guide panel 18 that has 8, 9 or 10pairs of guide rails 82 depending on whether a drawer guide panel 18 ismade of two guide rail components 84 each with four pairs of guide rails82, two guide rail components 84 each with five pairs of guide rails 82,or component 84 with four pairs of guide rails 82 and one guide railcomponent 84 with five pairs of guide rails 82.

The drawer guide panels 18 can be made of any material that willwithstand the wear caused by the constant sliding back and forth of thedrawers 20, and will support the weight of the drawers 20. Suchmaterials can include thermoplastics, thermoset plastics and metals.Preferably the drawer guide components 84 are injection molded,compression molded or thermoformed thermoplastic. If a drawer guidepanel 18 comprises two or more components 84, the components 84 can beheld together by screws, bolts, rivets, bonding or a snap lock feature.Preferably, the drawer guide panel 18 comprises two components 84 thatare fastened together with screws.

The drawer system 10, shown in FIG. 18, may further comprise at leastone lock bar assembly 86. This lock bar assembly 86 prevents theunauthorized opening of the drawers 20 in the drawer system 10 when itis activated. The lock bar assembly 86 must be located such that it canlock and unlock the plurality of drawers 20 positioned on one side ofthe drawer system 10. Should there be more than one drawer bay 28 on aside, a single lock bar assembly 86 can lock the drawers 20 in bothdrawer bays 28. Should the drawer system 10 be a two sided system withdrawers 20 on both sides of the system, then two lock bar assemblies 86would be required, one for each side of the drawer system 10.

Preferably, the lock bar assembly 86 is incorporated into the drawersystem 10 in such a way as to minimize any tolerance stackup problems.More preferably, the drawer lock bar assembly 86 is attached to thedrawer guide panel 18. This ensures that the lock bar assembly 86 willline up properly with the drawer slides 124, thereby minimizing anytolerance stackup problems.

As shown in FIGS. 22 and 23, the lock bar assembly 86 can include anymeans for locking the drawers 20 known in the art, including the lockingmeans disclosed in U.S. Pat. No. 4,822,116, Relyea et al., issued Apr.18, 1989, and incorporated herein by reference. Preferably, the lock barassembly 86 comprises a lock column 88 and at least one lock bar 90. Thelock column 88 provides a means for attaching and locating the lockbar(s) 90 within the drawer system 10. The lock bar assembly 86 cancomprise either one lock bar 90 from which extends at least one lockstem 92 or it can comprise a plurality of lock bars 90, each with atleast one lock stem 92. Preferably, the lock bar assembly 86 comprises aplurality of lock bars 90.

Preferably, the lock column 88 and the lock bar(s) 90 extendsubstantially the height of the drawer guide panel 18. More preferably,the lock column 88 includes a channel into which one lock bar 90 or aplurality of lock bars 90 slide. Most preferably, the lock column 88 isan extrusion with a substantially U-shaped profile. As FIG. 18 shows,the lock column 88 can be attached to the drawer system 10, preferablyto the drawer guide panels 18, by any means known in the art, includingbonding, snap lock features, fasteners. It could also be molded ormachined into the drawer guide panels 18 as an integral part of thedrawer guide panel 18. Preferably, the lock column 88 is connected tothe drawer guide panels 18 with screws.

Each lock bar 90, shown in FIGS. 22 and 23, has at least one means forlocking a drawer 20 that allow the drawer 20 to be closed if it is openwhen the lock bar assembly 86 is activated. Preferably, this lockingmeans comprises at least one locking stem 92 that can flex in only onedirection in a horizontal plane, thereby allowing an open drawer 20 tobe closed when the lock bar assembly 86 is engaged but not allowing aclosed and locked drawer 20 to open while the lock bar assembly 86 isactivated. More preferably, the lock stem 92 further comprises a lockingtab 94 that blocks the motion of a corresponding capture mechanism 134on a drawer slide 124 thereby preventing opening of the drawer 20, andthe geometry of the locking tab 94 and locking stem 92 is such that thestem 92 flexes only in one direction. When the drawer system 10comprises two drawer bays 28, the lock bar 90 must have two lockingstems 92 for each drawer guide height. See FIG. 23. One locking stem 92and tab 94 for each drawer 20 in each of the two bays 28. One lock bar90 can comprise two locking stems 92.

Preferably, the locking tabs 94 extend through one of a plurality ofholes 96 in the drawer guide panels 18, allowing the locking tab 94 tocontact the drawer slide 124. See FIG. 18. The plurality of holes 96 arepreferably arranged in a substantially vertical line. This vertical lineof holes 96 can be located anywhere across the width of the drawer guidepanels 18. Preferably, it is located either close to one of the twoedges of the drawer guide panels 18 or substantially in the center ofthe drawer guide panel 18. More preferably, there are two lines of holes96 in a drawer guide panel 18, one line close to each edge of the drawerguide panel 18.

At the top of the lock column 88 is a locking platform 98, shown in FIG.17. The platform includes the lock cam 100, which is preferably wedgeshaped. When the locking mechanism is activated, the lock cam 100 moveslaterally thereby causing the lock column 88 to move downward, allowingthe lock stems 92 to slide into position and causing the lock tabs 94 toblock the motion of the drawer slide 124. The lock cam 100 is connectedto the lock 102. Preferably, the connecting means are flexible so thatthe lock tray 104, which will be described further below, can be removedfrom the drawer system 10 while still connected to the drawer system 10.More preferably, the connecting means comprises a cable assembly.

As FIG. 24 shows, the lock 102 is preferably contained in a lock tray104 which can be accessed when the system is unlocked for easyreplacement of any piece of the lock 102. It is preferable that the lock102 be a plunger-type lock comprising a lock button 103 and a lock bar105: when the lock button 103 is pushed in, it causes a lock bar 105 tomove laterally, this lateral motion is translated through a cableassembly 101 to the lock cam 100, causing the lock cam 100 to move thelock column 88 which slides downward to move the locking stems 92, withtheir locking tabs 94, into the locked position. The plunger mechanismprovides a more reliable and more durable option than a cam lock,however any lock 102 known in the art can be utilized in the presentinvention.

The lock 102 is released by use of any means, including a mechanical keyor an electronic release mechanism. Electronic mechanisms are well knownin the art and include remote electronic devices and vibration detectingsystems that determine when a cart is not in use and automatically lockthe cart after a specified time period. Key releases 106 are also wellknown in the art. Any key release 106 known in the art can be used inthe present invention.

The lock bar 90 and the locking stems 92 must be made of materials thatexhibit good wear properties and are able to withstand being flexed.Preferably, they are made from injection molded thermoplastic. Anythermoplastic known in the art can be used; however, preferably the lockbar 90, locking stem 92, and locking tabs 94 are made of amorphousnylon. The lock bar 90, locking stems 92 and locking tabs 94 arepreferably molded as one piece. The lock bar 90 can comprise individualsegments stacked together or one continuous piece. The locking platform98 is preferably injected molded thermoplastic, more preferably it isNylon. The lock cam 100 is preferably made of a different material thanthat of the locking platform 98, so that the lock cam 100 and thelocking platform 98 do not fuse together over time. Preferably the lockcam 100 comprises acetal.

As illustrated in FIGS. 22 and 23, the lock cam 100 and the lock 102 arepreferably connected by a flexible connecting means 101 that must beable to translate the motion of the lock 102 to the lock cam 100 andprovide for the flexible connection of the lock tray 104 to the drawersystem 10. Preferably, the connecting means comprises a cable assembly101 that comprises a cable and a conduit through which the cable passes.The conduit serves to guide and constrain the motion of the cable. Thecable can be made of any material that has sufficient stiffness to beable to push the lock cam 100. Preferably, it is made of twisted wire.The conduit is preferably a multilayer conduit. More preferably, it is athree layer conduit comprising an inner liner that exhibits sufficientlubricity to allow the cable to slide through it without binding, amiddle layer to provide stiffness to constrain the motion of the cableand an outer jacket that provides additional stiffness. Most preferably,the liner is made from acetal, the middle layer is braided wire tube andthe jacket is extruded polypropylene. The pieces of the lock 102 can beproduced by machining, injection molding, compression molding, or anyother methods known in the art.

As FIGS. 1, 3 and 5 show, if the lock 102 is contained in a lock tray104, the lock tray 104 is inserted into the drawer system 10 like theother drawers 20, which will be further described below. It ispreferable that the lock tray 104 be easily accessible to authorizedpersonnel. The lock tray 104 should be able to be opened only when thedrawers 20 in the cart are unlocked. The opening mechanism 108, depictedin FIG. 24, for the lock tray 104 is preferably contained on the underside of the lock tray 104 and is accessible by opening the drawer 20immediately below the lock tray 104. Most preferably, it includes arelease which must be pulled down, thereby clearing a retaining detentand allowing the lock tray 104 to slide out.

The drawer system 10 can include a retractable means 109 of providinginformation to the cart operators. This retractable means 109 cancontain information about the features of the cart, the operation of thecart and any other information that the customer or the manufacturerwishes to include. Most preferably, the retractable means 109 includes aspiral bound notebook with pages that are laminated to providedurability. Such a means 109 includes a sliding tray that can beretracted into the drawer system 10 when not in use. Preferably thisretractable means 109 is contained in the lock tray 104. If it is housedin the lock tray 104, it preferably includes a sliding tray which can bepulled out separately from the lock tray 104 whether the cart is lockedor not.

As FIG. 19 shows, if more than one column of drawers 20 are disposedalong the length of a drawer system 10, there will need to be two drawerguide panels 18 for each column of drawers 20, so that each column ofdrawers 20 is supported by two drawer guide panels 18 that face eachother. If two columns of drawer guide panels 18 are used on one side ofa drawer system 10, the lock bar assembly 86 is preferably locatedbetween the two columns of drawers 20 so that the locking stems 92 andtheir associated locking tabs 94 can extend into both columns of drawers20. This allows one lock bar assembly 86 to lock and unlock both drawerbays 28 on one side of the drawer system 10.

In a configuration wherein drawers 20 are disposed on both sides of adrawer system 10, the drawer guide panels 18 containing the lock bars 90and locking stems 92 for the two sides of the cart are preferablydisposed back to back so that they occupy an area between the twocolumns of drawers 20. Drawer guide panels 18 hold drawers 20 on bothsides of the drawer system 10. Therefore, the drawer guide panels 18preferably have holes 96 through which locking tabs 94 can extend onboth ends of the drawer guide panels 18.

The drawer guide panels 18 can be held between the sides of the frame 12by any means known in the art. Preferably they are held in place at theends of the drawer system 10 by four sliding corner column trim pieces110, one at each corner, as shown in FIGS. 19, 20 and 25. If more thanone drawer bay 28 is desired in the drawer system 10, additional drawerguide panels 18 necessary to provide the additional drawer bays 28 areheld in place by sliding connectors 112. Preferably, such connectors 112are pieces with a substantially C-shaped profile, shown in FIG. 26 thatslidably connect the drawer guide panel 18 to the additional supportcolumns 30 disposed along the length of the base 24. This substantiallyC-shaped profile can have guide channels along its length to allow theconnecting of other pieces, such as a side panel, to the drawer system10. This eliminates the need for any additional fasteners. Once thedrawer guide panels 18 are in place in the frame 12, a corner columntrim piece 110 is slid down the length of each corner support cornercolumn trim piece 110. Lips on each corner column trim piece 110 hold acorresponding edge on the drawer guide panel 18 and on the supportcolumn 26, thereby connecting the corner column trim piece 110 and thedrawer guide panel 18 to each other and to the corner support column 26.These corner column trim pieces 110 and connectors 112 can be metal orthermoplastic. Preferably, they are extruded, although they can also bemachined. More preferably, they are made from extruded thermoplastic,most preferably they are extruded polyvinyl chloride.

To provide torsional stability to the drawer system 10, an end panel114, depicted in FIG. 28, is preferably slid between the support columns26 at the two ends of the drawer system 10. See FIG. 19. The supportcolumn 26 should have a guide channel along its length to allowinsertion of the end panel 114 without the need for any fasteners. Onlypractical considerations limit the material used to manufacture the endpanel 114. It should be lightweight, durable and relatively inexpensive.Preferably this end panel 114 comprises a sheet of thermoplastic. Morepreferably it comprises acrylonitrile butadiene styrene copolymer (ABS).The end panel 114 can be injection molded, thermoformed or extruded. Itcan also be made from extruded sheet machined to size. As shown in FIG.29, locating means may be formed in the end panels 114 to ensure thatthe end panel 114 is properly positioned in the drawer system 10 and toprovide a means of locking the end panel 114 in place in the drawersystem 10. Such locating means can comprise a groove 116 that runssubstantially the length of the end panel 114 and that slides into thereceiving channel in the support column 26. Such locating means can bemolded, extruded or machined into the end panel 114.

When only one side of the drawer system 10 has drawers 20, a sheet ofmaterial can be slid between guide channels to provide a back panel to aone-sided drawer system 10. This back panel can be manufactured of anymaterial used to manufacture the end panel 114. Likewise, if only onedrawer bay 28 is required on one side of a drawer system 10, any otherdrawer bays 28 can be covered by a side panel like that used for the endpanels 114. A back panel or a side panel can be slidably connected tothe drawer system 10 in the same manner as the end panels 114 areconnected. Additional holding means, such as a specially profiledextrusions 118 a, 118 b, 118 c, such as those shown in FIGS. 27a, 27 band 27 c, for slidably connecting a back panel or a side panel to theframe 12 may be attached to the support columns 26 or corner trim pieces110. Preferably, a specially profiled extrusion 118 a, 118 b, or 118 cis attached to the corner trim piece 110. More preferably, it isattached with two sided tape. The back and side panel can be made fromany of the materials used to manufacture the end panel 114.

A top 16, shown in FIG. 30, is placed on top of the frame 12. See FIG.3. The top 16 provides stability to the drawer system 10 because itconnects the two sides of the frame 12. If the frame 12 includestransverse support rods 32, the top 16 serves to connect the transversesupport rod 32 on one side of the frame 12 to the transverse support rod32 of the other side. Transverse support rods 32 can also be molded intoor attached to the top 16. The top 16 can also replace the transversesupport rods 32. If the top 16 replaces the transverse support rods 32,there are preferably stiffening means, such as ribs, molded or machinedinto the top 16 to provide the necessary stiffness and stability to thedrawer system 10.

The top 16 also provides a work surface. The top 16 can be attached tothe transverse support rods 32, or if it contains or replaces thetransverse support rods 32, to the support columns 26 by any means knownin the art. Such attaching means can include fasteners, bonding, or asnap lock feature. Preferably, the top 16 is bolted to the transversesupport rods 32. The top 16 can be manufactured of any material known inthe art that is sufficiently rigid and will withstand exposure tochemicals and medicines. It must be easily cleaned, aestheticallypleasing and durable. Preferably, it is made of a high pressure laminatecovering a wood product, similar to that used for counter tops and othercase goods, such as cabinetry.

It is also preferred that the top 16 have a top bumper 120 around itsouter perimeter. This material can be the same as or similar to thebumper 74 material used around the base 24 of the frame 12. It can becolor coordinated so as to match the bumper 74 at the base 24 of theframe 12. It can be thermoplastic, rubber or other elastomeric material,foamed or unfoamed. Most preferably it comprises polyurethane.

As previously described, drawers 20 can be inserted along one or twosides of the drawer system 10. There is no limitation (other thanpractical considerations) on the configuration or size of the drawer 20that can be utilized in the present invention. Drawers 20 typicallycomprise a drawer body 122 and two drawer slides 124, one on each sideof the drawer body 122, as shown in FIGS. 31-35. Drawers 20 like thosedescribed in U.S. Pat. No. 4,822,116, Relyea et al, issued Apr. 18,1989, incorporated herein by reference, can be used in the presentinvention. If drawers 20 are to be disposed along both sides of thedrawer system 10, it is preferable that the drawers 20 be of a depth ofapproximately one-half of the width of the drawer system 10.

For a single sided drawer system 10, drawers 20 that extendsubstantially the full width of the drawer system 10 are preferred. Sucha drawer 20 preferably is attached to a telescoping drawer slide 126that will allow the drawer 20 to be completely opened without fallingout of the guide rail 82. See FIGS. 36 and 37. Telescoping drawer slides126 are well known in the art. There is no limitation on theconfiguration of telescoping drawer slide 126 that can be used in thepresent invention. The telescoping drawer slide 126 is preferablyattached to the drawer guide panel 18 by fastening means, such as rivetsor screws. The drawer guide panel 18 preferably includes at least oneboss or molded-in insert 128 for receiving such fasteners, shown in FIG.18.

Cassettes, as defined above, are well known in the art. One or morecassettes may be inserted into the drawer guides 126 of the drawersystem 10. There is no limitation on the type of cassette that can beinserted into the drawer system 10 except that it must include asuitable drawer slide 124 that will fit into the drawer guide panel 18.Preferably, the cassette will include means of locking the cassette thatare activated by the lock bar assembly 86 of the drawer system 10 whenthe cassette is inserted into the drawer system 10. More preferably, thecassette will further comprise a locking system that can be engaged whenthe cassette is not held in the drawer system 10.

As shown in FIGS. 36 and 37, a drawer frame 180 that does not include abottom panel can also be used in the present invention. Such drawerframe 130 includes only side walls from which a removable tub 132 can besuspended. Such drawer frames 130 are known in the art as punch carddrawers. A punch card is defined as a plastic or paperboard frame,typically 6″×9″, with blister packs covered with a foil seal for holdingprescription medications. The drawer frames 130 allow tubs 132, usuallyfilled with patient medications held in punch cards, to be easilyinserted and removed from a drawer system 10 without the need forremoving individual punch cards from the tub 132. See FIG. 38.

The drawers 20 can be made of any material that is lightweight, strongenough to withstand the required loads and will withstand exposure tochemicals and medicines. They can be made of metals, thermoplastics, orcombinations thereof. It is preferable that the drawer body 122 be madeof thermoplastic. It can be manufactured by any means known in the artincluding thermoforming, compression molding, injection molding,fabricating and combinations thereof. More preferably, the drawer body122 is injection molded thermoplastic. It is most preferable that thedrawer body 122 be manufactured of ABS. Preferably, the drawer slide 124comprises an aluminum extrusion that is insert molded with a materialthat provides good wear characteristics as its slides on the drawerguide 82, preferably polypropylene.

Drawer bodies can be of varying heights and widths. The heights andwidths should be selected so that drawers 20 can be utilized in variouscombinations. For example, the drawer system 10 can have numerous veryshallow drawers 20, or one or two very deep drawers 20, or a combinationof shallow and deep drawers 20. It is important that the overallstack-up of the drawer height for a given drawer system 10 configurationfit within the standard heights selected for the drawer systems 10.Drawer bodies can also be narrow or wide.

As shown in FIGS. 31-35, along each side of a drawer 20 and extendingsubstantially the entire width of the drawer system 10 are the drawerslides 124. The drawer slides 124 extend beyond the depth of the drawer20 to allow the drawer 20 to be slid to a completely open positionwithout falling out of the drawer system 10. The drawer slides 124 aresupported between the guide rails 82 of the drawer guide panels 18. Itis important that the drawer slides 124 be disposed along the drawer 20such that they are staggered with one drawer slide 124 beingsubstantially one guide rail width higher than the other drawer slide124. This allows for drawers 20 to be disposed along both sides of thedrawer system 10. The staggered drawer slides 124 are further describedin U.S. Pat. No. 4,822,116, Relyea et al, issued Apr. 18, 1989,incorporated herein by reference.

On the outer edge of each drawer slide 124 are capture mechanisms 134for interfering with the locking tab 94, shown in FIG. 35. Preferablythere are at least two and more preferably there are at least three suchcapture mechanisms 134, which allow the drawer 20 to be locked in any ofthree positions and to prevent a partially open drawer 20 from beingopened further. Staggering the drawer slides 124 also allows anycombination of drawers 20 to be stacked back to back with any othercombination of drawers 20 on the other side of the drawer system 10, asmore fully described in U.S. Pat. No. 4,822,116, Relyea et al, issuedApr. 18, 1989, incorporated herein by reference.

As illustrated by FIGS. 39 and 40, one or more drawers 20 of the drawersystem 10 can be outfitted with a lockable lid 136. The lockable lid 136can cover all of the drawer body 122 or a portion thereof. Such alockable lid 136 is preferably made of a material that is able toprovide a substantial deterrent to unauthorized access of the contentsunder the lockable lid 136. More preferably, it is made of metal. Mostpreferably, it is made from individual strips 138 of metal that are heldin a lid frame 140. These individual strips 138 can be used fordifferent sized drawers 20 to allow for standardized manufacturing.Preferably, the metal strips 138 are 6063-T6 aluminum extrusions and thelid frame 140 includes ABS side plates.

While the lockable lid 136 can be attached directly to the drawer body122, it is preferably and removably attached to the drawer body 122 bymeans of a drawer divider plate 142. The drawer divider plate 142preferably has attachment means, such as holes for receiving fasteners,for the lockable lid 136. The drawer divider plate 142 is itselfattached to the drawer body 122 by attachment means, such as screws orrivets. Attaching the lockable lid 136 to the drawer divider plate 142allows the lid to be moved to another drawer 20 if preferred merely byunfastening the drawer divider plate 142 from the drawer body 122.

The drawer divider plates 142, with or without a lockable lid 136attached, also provide means for subdividing a drawer body 122 intocompartments. They provide slots into which individual dividers can bearranged to create compartments within the drawer body 122.

The lockable lid 136 includes its own lock 136 a that is separate fromthe lock bar assembly 86. The drawer 20 in which the lockable lid 136 isincluded will still be locked by the lock bar assembly 86 when thedrawer system 10 is locked. This lockable lid 136 provides additionalsecurity for particularly sensitive items, such as controlledsubstances. Any commercially available lock can be used, preferably acam lock cylinder is utilized.

A drawer 20 with a lockable lid 136 preferably includes a means forpreventing the removal of the drawer 20 from the drawer system 10 whenthe system is unlocked. Such means are well known in the art and caninclude a spring loaded tab attached to the drawer slide 124.

An accessory track 144, see FIGS. 41 and 42, may be disposed along thelength of the support columns 26 and is located so as to be accessibleafter the end panels 114 have been inserted, as shown in FIGS. 8 and 10.This accessory track 144 allows for the easy addition and removal ofaccessories to one or both ends of the drawer system 10. Preferably theaccessory track 144 comprises a plurality of plastic inserts 146 thatinclude a bolt hole 148 in the center and tabs 150 for capturingaccessory bars 152 thereby providing at least two different types ofattachment mechanisms. More preferably the accessory track 144 alsoincludes more than one captured nut so that some accessories can bescrewed into the accessory track 144 for more secure installation. It ismost preferable that the accessory track 144 be colored so that it ismore easily visible.

Accessories can be attached to the accessory track 144 by accessory bars152. See FIGS. 3, 5 and 7. Preferably the accessory bar 152 comprises aspring loaded locking mechanism 154 that can be compressed to allowinsertion of the locking mechanism between the locking tabs on the trackand then released so as to hold the locking mechanism in place, shown inFIGS. 43 and 44. Such a locking mechanism is preferably made ofinjection molded plastic however, it can also be made of metal.Accessories such as a refuse container 156 or a sharps container, areattached to the accessory bar 152 by any means known in the art.Preferably, such means comprises a telescoping holder 158 that allowsthe accessory to be extended away from the drawer system 10. Any sharpscontainer well known in the art can be used including, but not limitedto, those manufactured by Becton Dickinson and Company, Franklin Lakes,N.J.

A handle 159, shown in FIGS. 7 and 45, for ease of steering and pushingthe drawer system 10 can be bolted to the nuts contained in theaccessory track 144. Such a handle 159 can be any configuration known inthe art and is preferably attached by at least two bolts that screw intothe nuts in the accessory track 144. Similarly, an additional shelf 160for extension beyond the end of the drawer system 10 can be bolted tothe accessory track 144. Such a shelf 160 can be made of any of thematerials that can be used for the top 16. Preferably the tray is boltedwith brackets to the nuts in the accessory track 144. More preferablynuts are provided at more than one height, and most preferably at fourdifferent heights, so that the shelf 160 and/or handle 159 can belocated at more than one height, depending on customer preference. SeeFIGS. 1-4.

As shown in FIGS. 46 and 47, the drawer system 10 can further comprise acart top organizer 162 that rests on the top 16 and can be used to storefrequently used supplies. Such a cart top organizer 162 is preferablycompartmentalized. It can be manufactured of any materials. Preferably,it is injection molded or thermoformed thermoplastic. Such a containerpreferably includes at least one recess 164 for holding items thatextend above the cart top organizer 162, such as a stem 166 on which aneye level medication platform 168 can be located. Such a stem 166 has aslidably connected medication platform 168. This platform 168 can belocated at the eye level of the individual dispensing the medication sothat as liquid medication is poured into a dispensing cup, one caneasily and accurately view the volume markings on the dispensing cup.Other recesses 164 can hold a work light, preferably such a work lighthas a movable arm to allow the light to be moved to where it is needed.

The drawer pulls 170 on each of the drawers 20 are preferably configuredso that an operator is encouraged to pull the drawer 20 open fromapproximately the center of the drawer 20. See FIGS. 31 and 34. Morepreferably, the drawer pulls 170 provide an opening 172 for theinsertion of an operator's finger that is larger and more protrudedapproximately in the center thereby encouraging the drawer 20 to bepulled from the center.

Labels can be removably attached to the face of the drawers 20, as shownin FIGS. 48-50. A label holder 174 encapsulates the label such that anyliquids that are dripped on the cart will not get between the labelholder and the label. Preferably the label holder 174 comprises a clearplastic sheet that has been bent into a configuration such that itfollows the contour of the drawer 20 face, clips over the back of eachdrawer 20 face, and prevents liquids from dripping into the label andholds the label in place. More preferably, the label holders 174 aremade of acrylic or polycarbonate.

Drawer systems 10 of the present invention can be any length and widthand height. The length is dictated by the configuration of drawers 20.There can be one or more columns of drawers 20, limited only by theoverall cart size that a customer is willing to accept. As notedpreviously, the combinations of drawer configurations are numerous andcan be customized to meet each customer's requirements. The drawersystem 10 can be stationary or it can be a rolling cart. Accessories canbe attached on neither end, one end or both ends of the drawer system10. The drawers 20 can be disposed along one or both sides of a drawersystem 10.

What is claimed is:
 1. A modular drawer system comprising: a frame,comprising a substantially rectangular base and at least four supportcolumns extending from the base; at least four comer column trim pieces,each being slidably connected to one of said support columns, a top,which is attached to said frame; at least two additional support columnsdisposed on either side of the length of said base and forming a planethat is perpendicular to the length of said base; two drawer guidepanels which are slidably connected to said frame by said comer columntrim pieces and two drawer guide panels which are slidably connected tosaid additional support columns, wherein said four drawer guide panelsform a first drawer bay and a second drawer bay; at least one drawersupported by two of said four drawer guide panels; a lock bar assemblycomprising at least one lock bar with at least two lock stems, each lockstem having a lock tab, for each drawer plane such that one lock tablocks said first bay of drawers and the other lock tab locks said secondbay of drawers, wherein a drawer plane is defined as a horizontal planeat a given vertical position within the drawer system in which a drawerslide could be located, wherein each lock stem further comprises a locktab, and wherein said lock bar assembly is attached to one of saiddrawer guide panels that is attached to said additional support columns.2. A modular drawer system in accordance with claim 1 wherein drawersare disposed on both sides of said drawer system and further comprisinga first lock bar assembly and a second lock bar assembly.
 3. A modulardrawer system in accordance with claim 2 wherein the first lock barassembly is attached to the drawer guide panel in proximity to onevertical edge and the second lock bar assembly is attached to the drawerguide panel in proximity to the other vertical edge.